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Business Combination - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 23, 2018
Sep. 11, 2017
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2017
Business Acquisition [Line Items]            
Purchase price of acquisition       $ 30,993 $ 0  
Goodwill     $ 136,051 136,051   $ 117,435
Certified Thermoplastics Co., LLC            
Business Acquisition [Line Items]            
Percentage of outstanding common stock acquired 100.00%          
Purchase price of acquisition $ 30,500          
Payments to acquire business 31,100          
Total preliminary purchase price allocation 31,091          
Intangible assets 8,000          
Goodwill $ 18,616          
Lightning Diversion Systems, Inc.            
Business Acquisition [Line Items]            
Percentage of outstanding common stock acquired   100.00%        
Purchase price of acquisition   $ 60,000        
Total preliminary purchase price allocation   $ 62,000        
Selling, General and Administrative Expenses            
Business Acquisition [Line Items]            
Acquisition related costs     $ 300 $ 600